This composer wrote an aria, transcribed for orchestra by Leopold Stokowski, which employs textbook basso ostinato. BBC news programming takes a theme from this man's jig-like Irish march Lillibullero. Another musician borrowed a melody from this composer's Abdelazar for a piece subtitled "Variations and Fugue on a Theme" of this composer. In addition to writing the melody central to Benjamin Britten's The Young Person's Guide to the Orchestra, this composer wrote an opera that contains the aria "When I am Laid in Earth," also known as its first title character's "Lament." For 10 points, name this British composer of 
This composer wrote an aria, transcribed for orchestra by Leopold Stokowski, which employs textbook basso ostinato. BBC news programming takes a theme from this man's jig-like Irish march Lillibullero. Another musician borrowed a melody from this composer's Abdelazar for a piece subtitled "Variations and Fugue on a Theme" of this composer. In addition to writing the melody central to Benjamin Britten's The Young Person's Guide to the Orchestra, this composer wrote an opera that contains the aria "When I am Laid in Earth," also known as its first title character's "Lament." For 10 points, name this British composer of Dido and Aeneas.
This composer wrote an aria, transcribed for orchestra by Leopold Stokowski, which employs textbook basso ostinato.
Henry Purcell